Photographic-printing device



Oct. 23 1923.

B WEHRLI PHQTOGRAPHIC PRINTING Davxci:

Filed Agg. so 1922 ng'. f

iM. MIW

[1w/el@ Zal" Patented Oct. 23, 1923.

UNITED STATES BRUNO WHRLL'OF KILCHBERG, SWITZERLAND.

i PHOTOGRAPHIC-PRINTING- DEVICE.

Application iledk August 30, 1922. Serial No. 585,162.

To all whom t may concern:

Be it known that I, BRUNO WEHRLI, a.k

citizen of the Republic of Switzerland, residing at Kilchberg, Switzerland, have invented certain new and useful Improvements in Photographic-Printing Devices, of which the following is a specification, reference being had therein to the accompanying drawing.

The invention refers to improvements in a device for producing photographic prints and particularly post-cards on large sheets of sensitive paper, which renders a quick working possible without having to previously kcut the large sheets to the size of post-cards. l i

In contradistinction to known devices in which large sheets can be treated the device according to the present rinvention comprises a frame adapted to hold a sheet with its photogenic layer pointing downwards. This frame is displaceably arranged in a horizontal plane inone direction. Further thefdevice is provided with a box containing the source of light arranged below the frame with its opening pointing upwards, which box is adapted lto be displaced in a horizontal planey and in a direction that is perpendicular to the direction in which the frame can be displaced. Furthermore a device is arranged above the frame adapted to press parts of the sheet against a negative placed on the opening of the box. As the sensitive layer of the sheet to be treated is faced downwards the illumination of the dark room may be kept brighter than usual.

A constructional example of the invention is illustrated on the accompanying ydrawings in which:

Fig. 1 is a side view,

Fig. 2 is a plan view, and

Fig. 3 is a section along line A-B of Fig.

In the drawings, 1 denotes a rigid base part. 0n the latter there is displaceably mounted a horizontal frame 2 for holding` the sheet of sensitive paper. To the lateral parts 3 of the frame. which parts are of a wedge-shaped cross-section, clamps 4 are mounted serving to grip a sheet 5 of sensitive paper. which sheet is arranged with its sensitive layer facing downwards and which is thus only gripped at its two lateral sides, the other parts of the sheet hanging freely. The sheets are of such a size that a large number of prints can be produced on them in the lateral and in the longitudinal direction the individual prints being indicated in Fig. 2 by chain-dotted lines. In

Vthe example illustrated seven prints of postcards may be produced in the longitudinal direction of the sheet and five prints of post-cards in the transverse direction, thus a total of 35 post-cards can be printed on one sheet. To the frame 2 anut 6 is fixed, with which a screw threaded spindle 7 is in engagement. the latter being rotatably mounted in bearings 8 and prevented against axial displacement. A hand crank 9 is fixed to the one end ofthe spindle 7. The turning movement of this crank 9 may be stopped after every complete revolution by means of a slidably arranged bolt 10. The pitch of the thread of spindle 7 is so chosen that one complete revolution of the crank 9 causes the frame 3 to be displaced by a distance a corresponding approximately to the width of a post-card. On the base part 1 there is arranged a box 11 containing the source of light, which box can be displaced in a horizontal plane at right angles to the direction in which the frame 3 can be dispaced. The displacement of the box 11 is effected by means of a screw threaded spindle 12 which is rotatably mounted in bearings 13, but is prevented from being displaced in the axial direction. The spindle is in engagement with a nut fixed to the box 11 and is provided with a hand crank 14. Upon a turning of the hand crank 14 through an angle of 360o the box 11 is displaced by a distance b which corresponds approximately to the lengthk of the post-card. Inside the box 11 is the source of light 16, the burning of which is controlled by a known device 1'? which switches the light in and out automatically and controlsthe time of exposure. k Above the source of light 16 and below the frame 3 the box 11 is arranged to hold a negative 18, a pane of glass 19 is placed below the negative.

Above the sheet 5 a member 2O is arranged lined on its under side. for instance with felt. The member 20, i. e. the device for pressing parts of the sheet 5 against the negative in the box. 11, is provided on its upper side with a bar 2l of rectangular cross-section, on the top of which a bar 22 is loosely mounted, the latter having two wedge shaped portions 23 and a handle 24. When the bar 22 is displacedstowards the right in Fig. 3, the Wedge shaped portions 23 press against 5 is 1.111111@ 1 tlm 5500111111 11.11;'1111111111211 d x .I W, .1 4 5.111@ 111111, 0.-. 0.91.1111. 1S

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